2023每日刷题(五十七)
Leetcode—113.路径总和II
实现代码
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode() : val(0), left(nullptr), right(nullptr) {}
* TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
* TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
* };
*/
class Solution {
public:
vector<vector<int>> res;
vector<int> path;
void dfs(TreeNode* root, int sum) {
if(root == nullptr) {
return;
}
sum -= root->val;
path.push_back(root->val);
if(sum == 0 && root->left == nullptr && root->right == nullptr) {
res.push_back(path);
}
dfs(root->left, sum);
dfs(root->right, sum);
path.pop_back();
}
vector<vector<int>> pathSum(TreeNode* root, int targetSum) {
dfs(root, targetSum);
return res;
}
};
运行结果
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